Binocular telescope.



G, MEGKBAGH.

BINGGULAR TELESGOPE.

APPLIOATIGN FILED JAN. 12, 1912 Patented Sept. 3, 1912.

GEORG MEGKBAGH, OF SCHNEBERG, NEAR BERLIN, GERMANY.

'.BNOCULAB TELESCOPE.

Specification o f Letters Patent.

Patented sept. e, 1912.

Application led January 1.2, 1912. Serial No. 676,737.

To all 'whom it may concern,l

Be it known that I', GEORG Mnonnaon, manager, a subject of the Emperor of Germany, residing at Schneberg, near' Berlin, .in the Kingdom of Prussia, Germany, have invented certain new and useful Improvements in Binocular Telescopes, of which the following is a specification.

My invent-ion relates to improvements in binocular telescopes, and particularly inthat class of binocular .telescopes in which the rays of the light pass through a pair of tril angular prisms. And the object ot' the imv. provements is to provide a telescope of this from the outside o class in which the risrns can be adjusted i) the telescope without opening the casing thereof, so that such'adjustment can' be effected after mounting the telescope. 4This is of importance, because the prisms which are adjusted prior to closing the casing are'liable to be slightly displaced, and because the means for holding the prism inplace are frequently loosened. Itwisnot feasible to secure the said holding means by means of a set screw, because there is not sutlicient room, and because perforations in the wall of the casing as would be required for the s'et screw must as far as Ypossible be avoided. In my improved tele- .scope the upper corner of the prism which is opposite to the hypotenuse is held by 'means of a bridge piece which is mounted in such a way as 'to be longitudinally shiftable and to take along the prism in the direction of its hypotenuse, while the latter always uniformlybears on its seat. For adjusting the said bridge the latteris engaged by a setting member such for example as an eccentric which is accessible from the side of the lid of the telescope, and it is set in ad justed position by set screws which are likewise accessible from the side of the lid, so that the prism can not afterward be dis placed.

In order that my invention be more clearly understood example embodying the same has been shown in the accompanyin'g drawing in Ywhich the same numerals of reference have been used in all the views to indicate corresponding parte.

In said drawing-Figure l, is a longitu dinal section of one half of the telescope, Fig. 2, is a plan view of Fig. l, Figv 3, is a vertical section showing the set screw for securing the bridge piece in position on an enlarged scale, and Fig., 4, is a similar section of the adjusting member.

Within the casing l of the telescope a pair of prisms 4f and et are mounted on a transverse frame 5 so as to be slightly slidable thereon in the direction of their hypotenuses, so that they can be accurately ad l j usted symmetrically of the passages formed b the frame. Above the u er corner 6 of 1 the prism which is opposite to the hypotenuse a bridge piece Y of spring material is located which at its bottom side is equipped with a U-shaped member 8 engaging the upper corner 6 of the prism. As shown the said member is rotatable and longitudinally slidable on the bridge piece for which purpose it'is secured thereto by means of a screw 9 passing through a longitudinal slit 10 of the bridge piece. By means of-the said screw preliminary adjustment is iinu parted to the prism, whereupon the screw 9 is tightened so that it is immovable within the slit l0.

As shown the bridge piece Z is supported at its ends lbetween pairs of lugs il, l1 and 12, l2 projecting from the side walls of the casing. The upper lug ll is formed with en internally screw-threaded longitudinal bore 13 through which a clamping screw le is screwed by means of which the end of the bridge 7 located between the lugs il, l1 is secured in positionn Aes shown in 3, the clamping sores7 is formed with a small central projection le? which when the screw is screwed down passes into a longitudinal groove 7 formed in the upper surface ot the bridge 7 The projection le and the long;n tudinal groove provide a guide for this end of the bridge, so that it can not be displaced laterally. When screwing down the screw le its projection le forces the end of the bridge in rigid Contact with 'the lo" lug ll, whereby the bridge end occur held in place. The opposite end or the bridge which is located between the lugs and l2 is formed with a bore l5 engaged b the head i6 of a screw l? screwed lower lug i2. As shown the head of screw is eccentric tothe shaft oi' the screw so asto form a cam by means of ivhi h when turning the screw the is lo'eetudics nally shifted according to' the eccentricity of the head.\ The said longitudinal displacement takes place in either one of the directions indicated by the arrow shown in Fig. 4. The upper lug 12 is provided with 1 a screw-threaded bore. into which an internally screw-threaded sleeve 18 is screwed 18 is slightly retracted from the bridge. By'

Awhich is provided with internal screwthreads 19. Through the bore of the sleeve a screw driver can be inserted vwhich is adapted to engage the screw head 16.l At its lower vend the bore of the sleeve is enlarged as shown at 18', and this enlarged portion receives the screw head 16, so that the ysleeve can be firmly forcedA with its llower end on the bridge 7 without contacting with the screw head 15. Above the lugs 11 'and 12 the lid 2O is formed with apertures 21, 22 which can be closed by screws,

(not shown). After removing the said screws the set screw 14 and the eccentric adjustment has been effected the screw 9' is tightened. Thereupon the clamping screw 14'and the sleeve 18 are forced on the ends of the bridge 7. After applying the lid to the casing t-he screw'14 is slightly loosened, if readjustment is necessary, and the sleeve means of a screw driver passed through the bore 19 the eccentric screw 16 is now turned in the proper direction, whereby the bridge 7 is shifted in one or the other direction indicated by the arrowshownin Fig. 4. In this adjustment the bridge is guided with its end located between the lugs 11 and 11 on the projection 14', so that it can notb'e displaced laterally when being adjusted by the veccentric screw head 16. When 'the prism has thus been brought in its proper position, the clamping screw 14 is tightened in order to prevent the bridge from being displaced by the' sleeve 18 being screwed down. When both screws have been screwed down the prism is rigidly held in place.

The lower prism 4 is equipped with simi# lar adjusting means, as is indicated in Fig. 1. The lid is fastened by means of screws passed through bores 23.,

I claim herein as my invention:

1. In a telescope of the class described, theY combination with the casing and a prism mounted therein; of a prism-shifting device for moving the prism transversely of the optical axis of the telescope, said device being provided with a prism-holder adjustable the hollow of the sleeve.

therealong for giving the prism its rough adjustment; and mechanism for reciprocating said shifting device .and its prism-holder to give the prism its fine adjustment.

2. In a telescope of the class'described, the combination with the casing anda prism mounted therein; of a prism-shifting device which extends transversely of the optical axis of the telescope and engages the prism; mechanism mounted within the casing and accessible from outside the same for reciprocating said'device; and clamping lmeans for fastening the latter in its adjusted position.

3. In a telescope of the class described, the combination with the casing and a prism mounted therein; of means accessible from the outside of the casing for imparting ne adjustment to the prism; said means being provided with a device which engages the prism and Ais displaceable for giving rough adjustment thereto.

4. In a telescope of the class described, the combination with the casing, having a lid transverse to the optical axis of the tele.

scope, and a prism adjustable transversely of the optical axis of the telescope, of a bridge devicev operatively connected with said prism and adapted to impart adjusting I movement thereto, and a cam for reciprocating said bridge device, said cam being ac-v cessible through the lid of the casing.

5. In a telescope of the class described, the

combination with the casingr Vhav-ing a lid transverse to the optical axis of the telescope, and a prism adjustable transverselyA of the optical axis of the telescope, of 4a bridge member connected to the corner of the prism which is opposite to its hypote-v `nuse, and a cam engaging said bridge memcombination with the casing having a lidv transverse to the optical axis of thetele-A scope, and a prism .adjustable transversely of the optical axis of the telescope, of a bridge member connected to the corner of the prism which is opposite to its l1ypote' nuse, a cam engaging said bridge member, and a sleeve screwed lnto the caslng from the side of the lid and receiving said cam inV its hollow and adapted to clamp saidbridge member, said lid having a bore in line with 7. In a telescope ofthe class described, the combination with the casing, and-a prism, of a bridge member engaging said prism at a point intermediate its ends and having a longitudinal groove at one endya clamping screw engaging said bridge-l member within its groove, and means for lrecipro- ,s

eating said bridge member to move said. In testimony whereof I aix my signature prism transverselv: said means acting upon in presence of two Witnesses.

the other end of said bridge member and GEORG MECKBACH. said screw'and the walls of said groove co- Witnesses: 5 operating to control the direction of the ad- WOLDEMAR HAUPT,

)listing movement of the bridge member. HENRY VHAsiER. 

